Basically it is a vast collection of stardust and hydrogen gas isolated in space form similar system is called a "galaxy". A galaxy has an average of 100 billion stars. The milky way is our galaxy.
There are three types of galaxies: Spiral galaxy, Elliptical galaxy, and irregular galaxy.
Spiral galaxy: This galaxy appears in the form of a spiral wheel.
Elliptical Galaxy: This appears in the form of an elliptical structure. This is the oldest galaxy of the universe.
Irregular galaxy: This does not have a regular shape and is called as an irregular galaxy. They consist of hot blue stardust and gases.
These entire galaxies are moving very fast with very high velocity. Edwin Hubble discovered them in 1920.
Mohammed Thouseef K, XII A
Tiruchi: Kajhamian H.S. School
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